Shock absorber



'1. T. SMITH,v S. S. WILK'INS, AND 1. M. MANNIG.

SHOCK ABSORBER. APPLICATION FILED FE.`9,1A92|.

menteaJune, 1922.

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Specification of Letters Patent. Patented J 1111 6, '1922.

Application led February 9, 1921. Serial No. 443,665.

To all whom it may concern.:

Be it hereby known that we, JAMES T. SMITH, SYLVESTER S. VVILKINS, and JOSEPH M.. MANNING, lcitizens of the Unitedv States, and residents of Portland, in the county of Multnomah and State of Oregon, have invented a newr and useful Shock Absorber, of which the following is a specification.

This invention relates more particularly to springs suchr as are used on motor vehicles.

The object of our invention is to provide an exceedingly simple and eliicient shock absorber to be interposed between the usual springs of a car and the axles upon which they rest. A further object is to minimize the rebound and horizontal shocks encountered on vrough roads, and at the same time provide a spring having its strength increased indirect proportion to its load.

Wle attain these results in the manner described in the following specification and illustrated in the accompanying drawing, in

'which Figure 1 is a side elevation showing vone of these devices interposed between the spring and axis on a Chevrolet car. FigureI 2 is a rear elevation of Fig. 1. Figure 3 is a plan of Fig. 1.

Similar numbers of reference refer to the same orsimilar parts throughout the several views. l

Referring in detail to the drawing, we have constructed our device of a double U- shaped spring 10, in this case having its closed end 11 facing the rear ofthe car and resting upon a single flat spring 12 which.

is also U-shaped and having its closed end 13 toward the front of the car with its free end `111 having a large hole 15 which slidably carries the bolt 16 on which. is placed a coil sprin 17 and av washer 18'. The threaded portion 19 of the bolt 16 passes downwardly'through the leaf 20 of the car spring and a corresponding opening in the double spring 10 beneath which is a nut 21 and above which double spring and leaf is a nut 22. The double spring 10 and the single spring 12 are clamped to the axle member 23 by means of a bolt 24 which formerly held the leaf to the axle 23. The U-shapedvbolt 25 formerly ,engaged the notches`26 inthe sides ofv the leaf 20 and now passes `around the top and sides ofy the double spring 1Q and the single spring 12 through the pad 27on the ,axle

23, beneath which pad are `placed the nuts 28. The sides ofithe double spring 10 and l the single spring12 are notched to cor-` respond with the notch 26 in theleaf 20. kTt will be observed that a .slight space is and the nut'22 below same. This represents some of the compressionV of vthe spring 17 Vunder a normal load. The otherincrease of which is taken up by the doublefspring 10 and the single spring 12in succession. It will be noticed that the lvarious.springs come into play in successive Aand additional order thereby actually increasing the spring capacity of a vehicle directly in proportion with its load.

An" important feature of this device consistsv in the fact that in the rebound the spring action is the same-that is, increased proportionately with the degree ofrebound, which is not the casel when the regular leaf spring is used in `which the rebound is only counteracted by the lowermost leaf 20 of the spring. v

While we have thus "illustrated and describedour invention .it is not our intenf tion to limit ourselves to these precise forms of springs, their method of attachment,`or

the order of succession in which they come 1. In a shock absorber, the combination with a double U-shaped springsupporting yeo i left between the end` 14 of the .spring 12' l a ca'r, a single U-shaped spring whose upper end is positioned above the top of said double spring, a spiral spring above and acting upon said single spring, abolt arranged witliin. said spiral spring passing loosely through said Asingle 'spring "and clamping said double spring to vrthe car spring.

2. In a shock absorber, the combination with the main spring of an automobile of a double flat U-ehaped spring interposed be tween said main springv and Secured to the axle, an upwardly projecting bolt securing .f the upper end of said double Spring to the main spring, a single Hat spring attached to said axle and terminating above in a 

